COMPARISON OF SPECTRAL SIGNATURES AND DETERMINATION OF PSEUDO-INVARIANT FEATURES IN RADIOMETRICALLY CORRECTED IMAGES

VAIMAN N., A. B. BRIZUELA Y C. A. AGUIRRE

Scientia Intefluvius

Universidad Autónoma de Entre Ríos

Lugar: Paraná; Año: 2013 vol. 4 p. 30 - 39

1853-4422

The possibility of making multitemporal studies with Landsat images is greater as both, data banks and facilities to obtain them increase. However, to get comparable data is necessary to perform atmospheric and geometric calibrations. Some features in these images do not suffer radiometric alterations with time, so they can be consider as pseudo-invariant features. The analysis of these features indicates if corrected data are comparable. In this study, COST radiometric and geometric corrections were applied to 8 Landsat 5 TM images, pathrow 226-82, spanning from October 2008 to January 2010. Comparison of spectral signatures of six classes and determination of pseudo-invariant pixels were carried out. We conclude that in bands 1, 2 and 3, native forest, water vegetation and, to a lesser extent, island vegetation present a good similarity in the spectral signature and pseudo-invariant features. Band 4 accuse the grater variability and bands 5 and 7 are similar in the different categories